JP2000003778A - Induction coil and heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of performing satisfactory induction heating to a square explosion-proof belt having various sizes. SOLUTION: An induction coil 13 is formed of four coil elements 17, arranged facing opposite four flat surfaces of an explosion-proof belt 2 and flexible conductors 27 for connecting them in series. Each coil element is held by a cylinder device 12 and is set movable. Each coil element 17 can be positioned at a position optimal for the induction heating in relation to the explosion-proof belt 2 having a desirable size and to be set at the predetermined position, and furthermore, the induction current to be circulated in the explosion-proof belt 2 is generated by energizing the induction coil 13 for heating the explosion-proof belt 2, including corner parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction coil for induction heating an object to be heated having an outer peripheral surface having a plurality of flat surfaces connected in a polygonal shape, and a heating apparatus using the induction coil. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction coil capable of inductively heating an object to be heated of various sizes and a heating device using the induction coil. In the present specification, the “flat surface” is not limited to a flat surface in a strict sense, but also includes a substantially flat surface, for example, a curved surface having a large radius of curvature. Are not limited to those in which the corners are formed by intersecting straight lines, but also include those in which the corners are formed by curves such as arcs.

[0002]

2. Description of the Related Art Heretofore, there has been an application for induction heating an object to be heated having an outer peripheral surface in which a plurality of flat surfaces are connected in a polygonal shape. For example, in a process of disassembling and regenerating a used CRT, as shown in FIGS. 8A and 8B, a steel explosion-proof band 2 wound around a square outer peripheral surface of the CRT 1 is used for 150 to 150 mm. Heating to about 200 ° C, expansion and removal are performed, and for that heating,
Induction heating is used. For the induction heating of the explosion-proof band 2, an induction coil having a shape surrounding the outer peripheral surface of the explosion-proof band 2 and having a rigidity to maintain the shape has been used. As the induction coil, a copper pipe having a square cross section or a round cross section is usually used.

[0003]

However, since there are various sizes of cathode ray tubes, an induction coil is required for each size, and a large number of expensive induction coils must be prepared, resulting in high equipment costs. There was a problem.

The present invention has been made in view of such a problem, and is an object to be heated, such as an explosion-proof band attached to a cathode ray tube, having an outer peripheral surface in which a plurality of flat surfaces are connected in a polygonal shape. It is an object of the present invention to provide an induction coil capable of induction-heating an object to be heated of a plurality of sizes, and a heating device using the induction coil.

[0005]

According to the present invention, a plurality of coil elements are arranged corresponding to a plurality of flat surfaces on the outer periphery of an object to be heated, and a current supply means is connected to the plurality of coil elements. The object is configured to energize the plurality of coil elements so as to generate an induced current circulating along the outer peripheral surface thereof.
A flexible conductor is provided to allow the positions of the plurality of coil elements to be changed according to the size of the object to be heated.

[0006] With this configuration of the present invention, during induction heating, the object is circulated along the outer peripheral surface of the object to be heated without disposing an induction coil so as to surround the entire object. As the induced current flows, the entire circumference of the object to be heated can be satisfactorily heated, and the arrangement of the plurality of coil elements can be changed according to the size of the object to be heated, with a corresponding flat surface on the outer periphery of the object to be heated. Since induction heating can be performed by adjusting the position of the object to be a position suitable for induction heating, the outer peripheral surfaces of the objects to be heated having various sizes can be efficiently heated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An induction coil according to the present invention is for inductively heating an object to be heated having an outer peripheral surface in which a plurality of flat surfaces are connected in a polygonal shape. And a plurality of coil elements each having a linear portion for facing a corresponding flat surface, and an induced current circulating along the outer peripheral surface of the object to be heated. Power supply means for supplying power to the plurality of coil elements, and the power supply means has a flexible shape so as to allow the positions of the plurality of coil elements to be changed according to the size of the object to be heated. Characterized by having a conductor of With this configuration, the plurality of coil elements can be positioned at positions suitable for induction heating the outer peripheral surface of the object to be heated according to the size of the object to be heated. , An induced current is generated so as to rotate along the outer peripheral surface of the object to be heated, and the entire periphery of the object to be heated can be satisfactorily heated.

Here, the method of energizing the plurality of coil elements by the energizing means is such that an induced current circulating along the outer peripheral surface of the object to be heated is generated.
If the plurality of coil elements can be energized, a series system or a parallel system may be used.However, the series system is advantageous in that the currents of the plurality of coil elements can be equalized and that the impedance becomes high and that it is easy to match with the power supply. Desirable. When a plurality of coil elements are connected in series, it is preferable that the ends of adjacent coil elements are connected by a flexible conductor. With this configuration, the configuration of the energizing unit can be simplified.

It is preferable that a plurality of coil elements constituting the induction coil are provided with hollow portions penetrating in the direction of current supply, and that a water-cooled cable be used as a conductor used for the current supply means. With this configuration, a cooling medium such as water can flow through the coil element through the conductor, and the coil element and the conductor can be cooled simultaneously.

A heating device according to the present invention has an induction coil having the above-described configuration, and a plurality of coil element positioning means each holding a plurality of coil elements of the induction coil, and a coil holding the coil element positioning means. The element is moved to a position suitable for induction heating the corresponding flat surface of the object to be heated for any of a plurality of sizes of the object to be heated set at a predetermined position, and is held at that position. Is possible. According to the present invention, with this configuration, the plurality of coil elements can be positioned at a position corresponding to the size of the object to be heated by the positioning means, and the object to be heated of a plurality of sizes can be favorably induction-heated. it can.

It is preferable that each coil element of the induction coil provided in the heating device is provided with an insulating material on a surface facing the object to be heated. With this configuration, when the coil element is heated while being energized in the state of being close to the object to be heated, even if the coil element comes into contact with the object to be heated, insulation between the two is maintained and trouble can be avoided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic front view showing an induction coil according to an embodiment of the present invention and a heating apparatus using the same, with a minimum-sized object to be heated set. FIG. 2 shows the induction coil and the heating apparatus in a maximum size. FIG. 2 is a schematic front view showing a state in which the object to be heated is set. The induction coil and the heating device of this embodiment are for heating explosion-proof bands 2 and 2A attached to the outer periphery of the cathode ray tubes 1 and 1A as objects to be heated.
The four flat surfaces 2a or 2Aa have an outer peripheral surface connected in a square shape via four curved corners 2b or 2Ab.

A heating device, generally designated by the reference numeral 10, includes a cathode ray tube holding mechanism (not shown) for holding the cathode ray tube 1 at a predetermined position (position shown) whose center is on a predetermined reference point O, A frame 11 having a shape surrounding the cathode ray tube 1 held at a predetermined position;
The apparatus includes four hydraulic or pneumatic cylinder devices 12 attached to the inner surfaces of four sides of one, an induction coil 13 held by the cylinder devices 12, a power supply device 15, and the like. The induction coil 13 is provided corresponding to each of the four flat surfaces 2a of the explosion-proof band 2, and includes four coil elements 17 each having a linear portion for facing the corresponding flat surface.
And energizing means 19 for energizing the four coil elements 17.

Since the four coil elements 17 have the same configuration except that they have different lengths, the configuration of one coil element 17 will be described. As shown in FIG. 4, the coil element 17 is formed of a square pipe having a hollow portion 17a penetrating in the direction of current supply, and is usually made of copper. Both ends of the coil element 17 are closed with a suitable plate, and connection ports 17b (see FIG. 1) communicating with the hollow portion 17a are provided near the both ends, respectively. The width of the coil element 17 is selected to be equal to or smaller than the explosion-proof band 2 to be heated. In addition, as shown in FIG. 1, the length of the side including the corresponding flat surface 2a of the explosion-proof belt 2 attached to the cathode ray tube 1 of the minimum size to be processed by the heating device 10 (the curvature of both ends) (Including the length of the part). In FIG. 4, a thin insulating plate 22 such as glass fiber reinforced epoxy tape or mica is attached to the surface of the coil element 17 facing the explosion-proof band 2. Is also turned off. An insulating plate 24 such as a bakelite is attached to the surface of the coil element 17 opposite to the explosion-proof band 2, and is connected to the cylinder device 12 via the insulating plate 24.

In FIGS. 1 and 2, each of the four cylinder devices 12 adjusts the coil element 17 so as to be parallel to the opposing flat surfaces 2a, 2Aa of the CRT explosion-proof bands 2, 2A set at predetermined positions. And each coil element is arranged to be moved in a direction orthogonal to the linear portion thereof. Further, each of the cylinder devices 12 has a coil element 1 held therein.
7 is moved to a position suitable for induction heating with respect to the flat surfaces 2a, 2Aa, etc. of the explosion-proof bands of a plurality of sizes to be heated, for example, the explosion-proof bands 2, 2A, and is held at that position. The device for operating is connected. Thus, the cylinder device and the device for operating the same constitute coil element positioning means for positioning the coil element at a desired position according to the size of the object to be heated.

The energizing means 19 for energizing the four coil elements 17 includes a pair of connection ports 15 of the power supply 15.
a respectively connect flexible conductors 2 to connection ports 17b at adjacent ends of a pair of adjacent coil elements 17.
6 and flexible conductors 27 for connecting the connection ports 17b of the adjacent ends of the other adjacent coil elements 17 respectively. Thus, the four coil elements 17 arranged in a square shape are connected to the power supply device 15 in a state of being connected in series, so that current flows in the same direction in the circumferential direction. An induced current can be generated in a direction in which the current circulates.
The conductors 26 and 27 have a configuration that allows current to pass therethrough and a cooling medium such as cooling water and has appropriate flexibility. In the present embodiment, the conductors 26 and 27 are made of rubber, plastic, or the like. A water-cooled cable having a configuration in which a stranded copper wire is passed through an insulating and flexible tube is used.
With this configuration, the conductors 26 and 27 do not interfere with the movement of each coil element 17, and a cooling medium can be passed through each coil element 17.

Next, the heating operation by the heating device having the above configuration will be described. As shown in FIG. 1, when heating the explosion-proof band 2 of the small-sized cathode ray tube 1, the four coil elements 17 are positioned at positions suitable for induction heating of the explosion-proof band 2 by the four cylinder devices 12. , Hold in that position. In this state, the cathode ray tube 1 to be processed is inserted into the space surrounded by the four coil elements 17 by the cathode ray tube holding mechanism (not shown), and the center of the cathode ray tube 1 is located at a predetermined position on a predetermined reference point O. set. Next, the power supply 15 starts energizing the induction coil 13 and supplying the cooling medium, and the explosion-proof band 2 is induction-heated. At the time of this induction heating, a current flows in a direction of looping around each side of the rectangular shape in the four coil elements 17 arranged in a rectangular shape. Therefore, as shown by an arrow, an induced current flows around the explosion-proof band 2. Thereby, the explosion-proof band 2 can be favorably induction-heated including its corners. After heating the explosion-proof band 2 to a desired temperature (for example, about 200 ° C.), the power supply to the induction coil 13 is stopped, the heating is completed, the CRT 1 is removed from the expanded explosion-proof band 2, and the next step is performed. send. Thus, one heating cycle is completed.

Next, as shown in FIG. 2, when the explosion-proof band 2A of the large-sized cathode ray tube 1A is heated, the four coil elements 1 are moved by the four cylinder devices 12.
7 is positioned at a position suitable for induction heating of the explosion-proof band 2A and held at that position. In this state, the cathode ray tube 1A to be processed is set at a predetermined position, and the explosion-proof band 2A is induction-heated. At the time of this induction heating, since the explosion-proof band 2A is large in size, each coil element 17 is considerably shorter than the opposing flat surface 2Aa and faces each central portion. Since the element 17 is not located, it is not possible to generate an induced current directly in the coil element 17 at the corner. However, as described above, the current flows in the four loop elements 17 in the rectangular loop direction, so that an induced current is generated in the explosion-proof band 2A in the opposite direction. 2
An induced current flowing around A flows. For this reason, even in the corner portion, even though the induction current may be somewhat smaller than the induction current in the portion facing each coil element 17, the same order of induction current flows.
While using the short coil element 17, the explosion-proof band 2A can be heated over the entire circumference.

Small and large CRTs 1, 1
Induction heating is performed for the medium-sized cathode ray tube of A in the same manner. Thus, in the heating device 10 of the above embodiment, the explosion-proof band 2 attached to the CRTs 1 and 1A of various sizes by using one induction coil 13,
2A etc. can be induction heated.

In the above embodiment, the positioning of each coil element 17 with respect to the explosion-proof bands 2, 2A and the like is performed by using the positioning means provided with the cylinder device. Alternatively, the positioning means may be omitted, each coil element may be mounted on a holding means capable of adjusting the mounting position, and the mounting position may be adjusted manually. However, if the positioning means is provided, the positioning of each coil element can naturally be performed automatically, and the effect of significantly reducing the work load on the operator can be obtained.

Further, in the above-described embodiment, the description has been made assuming that each coil element 17 is positioned at a position corresponding to the size of the cathode ray tube before setting the cathode ray tube. ,
The heating operation may be performed by a method of positioning each coil element 17. That is, as shown in FIG.
The four coil elements 17 are widely opened, and in this state, the CRT 1 to be processed is set at a predetermined position where the center thereof is on a predetermined reference point O by a CRT holding mechanism (not shown). Then, the four cylinder devices 12 are operated to move the coil elements 17 held by the four cylinder devices 12 toward the opposing flat surface of the explosion-proof band 2, and as shown in FIG. To stop at a position that is suitable for induction heating, and hold at that position to perform induction heating. Further, the stop at the above-mentioned position is automatically performed based on the position information by the distance sensor, or based on stress information when the protrusion is provided on the surface of the insulating plate and the protrusion comes into contact with the target surface. May be performed. After the heating, each coil element 17 is widely opened again, and the cathode ray tube 1 is taken out.
Send to the next step. If the four coil elements 17 are opened and closed when the cathode ray tube is inserted and removed, even if there is a slight error in the position when the cathode ray tube is inserted and removed, the cathode ray tube may hit the coil element and cause a trouble. Nothing.

In the above embodiment, the energizing means 19 for energizing the four coil elements 17 connects the ends of the four coil elements 17 to the conductor 2 at three places.
7, the four coil elements 17 are connected in series, but the energizing means is not necessarily limited to the configuration in which the four coil elements 17 are connected in series, A configuration using both series and parallel may be used. For example, the energizing means 19 shown in FIG.
A is a connection in which the connection ports 17b at adjacent ends of one set of adjacent coil elements 17 are connected in series by a flexible conductor 27, and the adjacent ends of the other set of adjacent coil elements 17 are connected to each other. The connection ports 17b are also connected in series by a flexible conductor 27, and two sets of series coil units in which the coil elements 17 are connected in series are connected in parallel by a conductor 28, and a current is applied to each of the coil elements 17, Each of the rectangular elements formed by the coil elements is connected so as to flow in the direction of looping around each side. FIG.
The energizing means 19B shown in (b) is a direction in which the four coil elements 17 are arranged in parallel by the conductors 29, and the current circulates through each coil element 17 in a loop around each square side formed by the coil element. Are connected so as to flow to These energizing means 19A, 19B
In this case, the entirety of the conductor 28 or 29 or the portion connected to each coil element is made flexible. With this configuration, each coil element 17 can be positioned at a desired position in accordance with the size of the explosion-proof belt to be heated, and at the time of induction heating, an induction current that circulates around the explosion-proof belt is generated, thereby heating well. be able to.

FIG. 6 shows an induction coil 33 according to another embodiment of the present invention. Induction coil 33 of this embodiment
Also, four coil elements 37 are provided corresponding to the four flat surfaces 2a of the explosion-proof band 2, respectively. The coil emergent 37 has a linear portion 37a for facing the corresponding flat surface 2a. In addition to the coil elements 37b, the bent portions 37b of the respective coil elements are adjacent to the coil elements 37b which are bent at a right angle from one end thereof. For example, they are arranged so as to be arranged in parallel so as not to interfere with the linear portions 37a, and adjacent ends are connected by a flexible conductor 27. Other configurations are the same as those of the embodiment shown in FIGS. In the embodiment shown in FIG. 6, when heating the explosion-proof band 2 of the small-sized cathode ray tube 1, each coil element 37 is positioned in the state shown in FIG. 6, but as shown in FIG. When heating the explosion-proof band 2A of 1A, each coil element 37 is positioned and used as shown in FIG. Thereby, similarly to the embodiment shown in FIG. 1, the explosion-proof bands 2 and 2A of different sizes can be heated.

In the embodiment shown in FIGS. 6 and 7, the coil element 37 having a longer linear portion for facing the flat surface of the object to be heated (explosion-proof band) than the embodiment shown in FIG. Can be used, and an advantage that heating of a large-sized object to be heated can be performed more favorably can be obtained. Note that FIG.
In the embodiment of FIG. 7, when each coil element 37 is positioned at a predetermined position with respect to the explosion-proof bands 2 and 2A of different sizes, if each coil element is only moved in a direction perpendicular to its linear portion. Instead, it must be moved in parallel. Therefore, each coil element 37
The positioning means for positioning the coil element at a predetermined position has a function of moving each coil element in an inclined direction as shown by an arrow BB in FIG. 6 while keeping its linear portion parallel. What should be done.

[0025]

As described above, the induction coil according to the present invention corresponds to a plurality of flat surfaces on the outer peripheral surface of the object to be heated.
A plurality of coil elements having linear portions for facing the flat surface are provided, and the plurality of coil elements generate an induced current circulating along the outer peripheral surface on the outer peripheral surface of the object to be heated. And a flexible conductor to allow the energizing means to change the positions of the plurality of coil elements according to the size of the object to be heated. Therefore, a plurality of coil elements can be positioned at a position suitable for induction heating and induction heating can be performed on objects to be heated of different sizes. Since an induction current circulating along the outer peripheral surface of the object flows, it is possible to satisfactorily heat the object to be heated without disposing an induction coil all around the object to be heated. Heated object , It can be efficiently heated,
Therefore, there is no need to prepare a large number of induction coils according to the size of the object to be heated, which has the effect of reducing equipment costs.

Further, the heating device of the present invention has the induction coil having the above-described structure and is configured to position a plurality of coil elements at desired positions by means of coil element positioning means. Each of the positioning means can be positioned at a desired position corresponding to the size of the object to be heated, and the object to be heated can be efficiently induction-heated, and the outer peripheral surfaces of the object to be heated of various sizes can be efficiently heated. In addition to this, there is an effect that the work load on the operator can be reduced, and it is not necessary to prepare a large number of induction coils according to the size of the object to be heated, so that equipment costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an induction coil and a heating device according to an embodiment of the present invention with a small-sized CRT set therein.

FIG. 2 is a schematic front view showing the embodiment shown in FIG. 1 with a large-sized CRT set therein;

FIG. 3 is a schematic front view showing the embodiment shown in FIG. 1 with a coil element opened;

FIG. 4 is a schematic sectional view taken along the line AA of FIG. 1;

FIGS. 5 (a) and 5 (b) are schematic front views of an induction coil provided with current supply means different from the embodiment shown in FIG. 1;

FIG. 6 is a schematic front view showing an induction coil according to another embodiment of the present invention with a small-sized cathode ray tube set.

FIG. 7 is a schematic front view showing the induction coil shown in FIG. 6 with a large-sized CRT set therein;

FIGS. 8A and 8B are a schematic perspective view and a schematic sectional view of a cathode ray tube, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A CRT 2, 2A Explosion-proof band 2a, 2Aa Flat surface 10 Heating device 11 Frame 12 Cylinder device 13 Induction coil 15 Power supply device 17 Coil element 17a Hollow portion 17b Connection port 19 Conducting means 22 Insulating plate 24 Insulating plate 26, 27, 28, 29 conductor

Continuation of the front page (72) Inventor Tsukasa Maenozono 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within the Technical Department of Daiichi High Frequency Industry Co., Ltd. No. 1 Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yu Higuchi 2-1-1, Araimachi, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. 1-1-1 Tazakicho Mitsubishi Heavy Industries, Ltd. Kobe Shipyard F-term (reference) 3K059 AA08 AA10 AB04 AC37 AD03 AD23 AD34 AD37 AD40 CD44 CD48 CD55 CD73 CD76

Claims (5)

[Claims] 1. An induction coil for induction heating an object to be heated having an outer peripheral surface in which a plurality of flat surfaces are connected in a polygonal shape, wherein the induction coil is provided corresponding to the plurality of flat surfaces of the outer peripheral surface. A plurality of coil elements having a linear portion for facing a corresponding flat surface, and the plurality of coil elements so as to generate an induced current circulating along the outer peripheral surface of the object to be heated. An energizing unit for energizing, wherein the energizing unit includes a flexible conductor so as to allow the positions of the plurality of coil elements to be changed according to the size of the object to be heated. Characteristic induction coil. 2. The induction coil according to claim 1, wherein said energizing means includes a flexible conductor for connecting end portions of adjacent coil elements in series. 3. The induction according to claim 1, wherein the coil element is provided with a hollow portion penetrating in the direction of electric current, and a water-cooled cable is used as the conductor so that a cooling medium can be circulated and cooled. coil. 4. An induction coil according to claim 1, further comprising: a plurality of coil element positioning means respectively holding a plurality of coil elements of said induction coil, wherein said coil element positioning means is provided. However, the held coil element is moved to a position suitable for induction heating the corresponding flat surface of the object to be heated, for any of a plurality of sizes of the object to be heated set at a predetermined position. A heating device having a configuration capable of being held in a position. 5. The heating device according to claim 4, wherein an insulating material is attached to a surface of the coil element facing the object to be heated.